I find Tsubaki Shinra, who is part of the Sitri group, quite appealing in fanfictions. Her loyalty to Sona and her growth as a character, especially in terms of her combat abilities and relationships, are well - written in some of the better fanfics.
One common theme is family loyalty. Since the Sitri family is an important part of the Highschool DxD universe, many fanfictions explore the bonds and loyalty within the family. For example, a Sitri character might go to great lengths to protect their family's honor or secrets.
One great Highschool DxD OC Sitri fanfiction is 'The Sitri's New Ally'. It has an interesting plot where the OC, a Sitri, forms unexpected alliances within the school's supernatural hierarchy. The character development is well - done, and it keeps you engaged throughout.
One great Highschool DxD Sitri fanfiction is 'The Sitri's Ascent'. It delves into the unique powers and family dynamics of the Sitri clan within the Highschool DxD universe. The story follows a young Sitri character as they navigate the challenges of the school and the supernatural world. It has an engaging plot with well - developed characters.
Start with giving the OC Sitri a distinct personality trait. For example, if they are extremely curious, it can drive their actions and decisions. They could be constantly exploring the world of Highschool DxD and getting into all sorts of situations because of their curiosity.
Highschool DxD OC Sitri fanfiction is unique because it gives a chance to expand on the Sitri lore. In these fanfictions, we can see how an OC Sitri might interact with other characters like the Gremory or the Phoenix clan. The stories can also explore the Sitri's magical abilities in more detail, such as their use of magic circles and spells specific to their clan.
Issei Hyoudou can also be a popular character in these fanfictions. His growth from a normal human to a powerful devil is an interesting arc. In Si Sitri fanfiction, he could interact with the Sitri family in various ways, perhaps getting involved in their schemes or forming relationships with the Sitri characters.
In a Naruto and High School DxD fanfiction, there could be a scenario where the protagonists of both stories meet in a neutral dimension. Issei from High School DxD might be intrigued by Naruto's ninja skills and determination. Naruto, in turn, could be curious about Issei's Sacred Gear. They could start training together, sharing their knowledge and skills, and ultimately have to face a common enemy that threatens both their worlds.